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Issue 2, 2011
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Grating coupler integrated photodiodes for plasmon resonance based sensing

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Abstract

In this work, we demonstrate an integrated sensor combining a grating-coupled plasmon resonance surface with a planar photodiode. Plasmon enhanced transmission is employed as a sensitive refractive index (RI) sensing mechanism. Enhanced transmission of light is monitored via the integrated photodiode by tuning the angle of incidence of a collimated beam near the sharp plasmon resonance condition. Slight changes of the effective refractive index (RI) shift the resonance angle, resulting in a change in the photocurrent. Owing to the planar sensing mechanism, the design permits a high areal density of sensing spots. In the design, absence of holes that facilitate resonant transmission of light, allows an easy-to-implement fabrication procedure and relative insensitivity to fabrication errors. Theoretical and experimental results agree well. An equivalent long-term RI noise of 6.3 × 10−6Image ID:c0lc00081g-t1.gif is obtained by using an 8 mW He–Ne laser, compared to a shot-noise limited theoretical sensitivity of 5.61 × 10−9Image ID:c0lc00081g-t2.gif. The device features full benefits of grating-coupled plasmon resonance, such as enhancement of sensitivity for non-zero azimuthal angle of incidence. Further sensitivity enhancement using balanced detection and optimal plasmon coupling conditions are discussed.

Graphical abstract: Grating coupler integrated photodiodes for plasmon resonance based sensing

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Publication details

The article was received on 08 Jun 2010, accepted on 15 Sep 2010 and first published on 29 Oct 2010


Article type: Paper
DOI: 10.1039/C0LC00081G
Citation: Lab Chip, 2011,11, 282-287
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    Grating coupler integrated photodiodes for plasmon resonance based sensing

    B. Turker, H. Guner, S. Ayas, O. O. Ekiz, H. Acar, M. O. Guler and A. Dâna, Lab Chip, 2011, 11, 282
    DOI: 10.1039/C0LC00081G

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